You can tame it on primitive plus but you need to make the kibble in a cooking pot. It won't work if you make it in a cauldron. Hopefully that's helpful to those that are trying to make kibble but cannot.
Can easily over encumber itself gathering organic polymer. However, using a quetzal as a carrier of both the animal and the polymer can allow for very successful polymer runs. Sometimes bringing in excess of 1000 in a hour run on an island server.